rtmp: drop support

[bagder]

• librtmp has no test cases, makes no proper releases and has not had a single commit within the last year

• librtmp parses the URL itself and requires non-compliant URLs for this

• we have no RTMP tests

• RTMP is barely used by curl users (2.2% self-identified in the 2025 survey)

[Copilot]

Pull request overview

This PR removes RTMP (librtmp-backed) support across curl/libcurl by deleting the protocol handler, dropping build/config integration, and updating documentation and CI to reflect that RTMP is no longer supported.

Changes:

• Remove RTMP protocol implementation and scheme/port/version plumbing from libcurl.
• Remove librtmp detection/configuration from Autotools, CMake, VMS tooling, and CI matrices.
• Update user-facing docs/help text to stop advertising RTMP and to record the removal.

Reviewed changes

Copilot reviewed 35 out of 35 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/tool_help.c	Simplifies protocol listing (no RTMP special-casing).
scripts/schemetable.c	Drops RTMP-related schemes from scheme-table generator.
scripts/ciconfig.pl	Removes librtmp from CI config options list.
scripts/cd2nroff	Removes RTMP/RTMPS from known protocol map for docs generation.
projects/vms/generate_config_vms_h_curl.com	Removes USE_LIBRTMP handling from VMS config generation.
lib/version.c	Removes RTMP version reporting and RTMP schemes from supported protocol list.
lib/urldata.h	Removes RTMP default port constants.
lib/url.c	Removes RTMP scheme integration and regenerates perfect-hash scheme table without RTMP.
lib/curl_rtmp.h	Deletes RTMP scheme declarations / version helper header.
lib/curl_rtmp.c	Deletes RTMP protocol handler implementation.
lib/curl_config-cmake.h.in	Removes USE_LIBRTMP CMake config define.
lib/Makefile.inc	Removes RTMP source/header from build lists.
docs/libcurl/symbols-in-versions	Marks RTMP protocol macros as removed (version attribution needs alignment).
docs/libcurl/opts/CURLOPT_REDIR_PROTOCOLS_STR.md	Removes RTMP* from protocol string list.
docs/libcurl/opts/CURLOPT_PROTOCOLS_STR.md	Removes RTMP* from protocol string list and adds history note (version attribution needs alignment).
docs/cmdline-opts/_PROTOCOLS.md	Removes RTMP(S) section from command-line protocol docs.
docs/cmdline-opts/_DESCRIPTION.md	Removes RTMP/RTMPS from supported protocol list.
docs/URL-SYNTAX.md	Removes RTMP schemes, ports, and RTMP URL syntax section.
docs/INSTALL.md	Removes --without-librtmp from documented configure options.
docs/INSTALL-CMAKE.md	Removes USE_LIBRTMP and related variables from CMake documentation.
docs/HISTORY.md	Adds an entry about RTMP removal (currently written as a future date).
docs/FAQ.md	Removes RTMP/RTMPS from protocol list.
docs/DEPRECATE.md	Adds RTMP to “Past removals” list (version attribution needs alignment).
configure.ac	Removes --with/--without-librtmp support and protocol summary output for RTMP.
README.md	Removes RTMP/RTMPS from supported protocol list.
Makefile.am	Removes CMake/FindLibrtmp.cmake from distributed files.
CMakeLists.txt	Removes USE_LIBRTMP option, find_package wiring, and feature listing.
CMake/curl-config.in.cmake	Removes librtmp dependency propagation from generated curl-config CMake package.
CMake/FindLibrtmp.cmake	Deletes the CMake find-module for librtmp.
.github/workflows/macos.yml	Removes librtmp/rtmpdump from CI jobs (one job has an invalid CMake flag token).
.github/workflows/linux.yml	Removes librtmp packages/config flags from Linux CI jobs.
.github/workflows/linux-old.yml	Removes librtmp packages/config flags from legacy Linux CI jobs.
.github/workflows/codeql.yml	Removes librtmp from CodeQL build dependencies/config.
.github/scripts/cmp-config.pl	Removes librtmp header define from config comparison script.
.github/labeler.yml	Removes RTMP label automation rules.

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[bagder]

augment review

[augmentcode]

🤖 Augment PR Summary

Summary: This PR removes RTMP protocol support from curl/libcurl.

Changes:

• Drops the librtmp integration across Autotools and CMake (options, find-modules, config exports).
• Deletes the RTMP protocol implementation and scheme registrations from the library.
• Updates scheme lookup hashing/table generation to exclude RTMP-related schemes.
• Removes RTMP from version/protocol reporting in libcurl and from the curl tool’s version output handling.
• Cleans up CI workflows and helper scripts to stop installing/configuring librtmp.
• Updates user and API documentation to remove RTMP/RTMP* mentions and document the removal in project history.

Technical Notes: RTMP depended on the external librtmp/rtmpdump codebase; this change eliminates that dependency and the associated maintenance/testing surface.

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[augmentcode]

Review completed. 1 suggestions posted.

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[bagder]

@aisle-analyzer

[aisle-research-bot]

🔒 Aisle Security Analysis

✅ We scanned this PR and did not find any security vulnerabilities.

_{Aisle supplements but does not replace security review.}

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Analyzed PR: #20673 at commit 268cee2

_{Last updated on: 2026-03-03T11:09:42Z}

[Copilot]

Pull request overview

Copilot reviewed 37 out of 37 changed files in this pull request and generated 1 comment.

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